Around a billion years ago, a geological event occurred in North America that could have completely changed the continent as people know it. This event could have split the North American continent in ...

Why it's incredible: The rift nearly broke North America in half around 1 billion years ago. North America's "broken heart" is an ancient rift valley in the Midwestern United States. The rifting began ...

Boulder, CO, USA - An international team of researchers has found the strongest evidence yet that parts of North America and Antarctica were connected 1.1 billion years ago, long before the ...

The Midcontinent Rift System represents a failed continental rift that began forming ca 1.1 billion years ago as Laurentia underwent regional extension and plume-related upwelling of the mantle.